/*
 *  Copyright 1999-2019 Seata.io Group.
 *
 *  Licensed under the Apache License, Version 2.0 (the "License");
 *  you may not use this file except in compliance with the License.
 *  You may obtain a copy of the License at
 *
 *       http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 */
package io.seata.server.session;

import io.seata.common.util.CollectionUtils;
import io.seata.config.Configuration;
import io.seata.config.ConfigurationFactory;
import io.seata.core.constants.ConfigurationKeys;
import io.seata.core.context.RootContext;
import io.seata.core.exception.TransactionException;
import io.seata.core.model.BranchType;
import io.seata.core.model.GlobalStatus;
import io.seata.metrics.IdConstants;
import io.seata.server.UUIDGenerator;
import io.seata.server.coordinator.DefaultCoordinator;
import io.seata.server.metrics.MetricsPublisher;
import io.seata.server.store.StoreConfig;
import io.seata.server.store.StoreConfig.SessionMode;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.slf4j.MDC;

import java.util.Collection;
import java.util.List;
import java.util.Objects;

import static io.seata.common.DefaultValues.DEFAULT_ENABLE_BRANCH_ASYNC_REMOVE;

/**
 * The type Session helper.
 *
 * @author sharajava
 */
public class SessionHelper {

	private static final Logger LOGGER = LoggerFactory.getLogger(SessionHelper.class);

	/**
	 * The constant CONFIG.
	 */
	private static final Configuration CONFIG = ConfigurationFactory.getInstance();

	private static final Boolean ENABLE_BRANCH_ASYNC_REMOVE = CONFIG
			.getBoolean(ConfigurationKeys.ENABLE_BRANCH_ASYNC_REMOVE, DEFAULT_ENABLE_BRANCH_ASYNC_REMOVE);

	/**
	 * The instance of DefaultCoordinator
	 */
	private static final DefaultCoordinator COORDINATOR = DefaultCoordinator.getInstance();

	private static final boolean DELAY_HANDLE_SESSION = StoreConfig.getSessionMode() != SessionMode.FILE;

	private SessionHelper() {
	}

	public static BranchSession newBranchByGlobal(GlobalSession globalSession, BranchType branchType, String resourceId,
			String lockKeys, String clientId) {
		return newBranchByGlobal(globalSession, branchType, resourceId, null, lockKeys, clientId);
	}

	/**
	 * New branch by global branch session.
	 * @param globalSession the global session
	 * @param branchType the branch type
	 * @param resourceId the resource id
	 * @param lockKeys the lock keys
	 * @param clientId the client id
	 * @return the branch session
	 */
	public static BranchSession newBranchByGlobal(GlobalSession globalSession, BranchType branchType, String resourceId,
			String applicationData, String lockKeys, String clientId) {
		BranchSession branchSession = new BranchSession();

		branchSession.setXid(globalSession.getXid());
		branchSession.setTransactionId(globalSession.getTransactionId());
		branchSession.setBranchId(UUIDGenerator.generateUUID());
		branchSession.setBranchType(branchType);
		branchSession.setResourceId(resourceId);
		branchSession.setLockKey(lockKeys);
		branchSession.setClientId(clientId);
		branchSession.setApplicationData(applicationData);

		return branchSession;
	}

	/**
	 * New branch
	 * @param branchType the branch type
	 * @param xid Transaction id.
	 * @param branchId Branch id.
	 * @param resourceId Resource id.
	 * @param applicationData Application data bind with this branch.
	 * @return the branch session
	 */
	public static BranchSession newBranch(BranchType branchType, String xid, long branchId, String resourceId,
			String applicationData) {
		BranchSession branchSession = new BranchSession();
		branchSession.setXid(xid);
		branchSession.setBranchId(branchId);
		branchSession.setBranchType(branchType);
		branchSession.setResourceId(resourceId);
		branchSession.setApplicationData(applicationData);
		return branchSession;
	}

	/**
	 * End committed.
	 * @param globalSession the global session
	 * @param retryGlobal the retry global
	 * @throws TransactionException the transaction exception
	 */
	public static void endCommitted(GlobalSession globalSession, boolean retryGlobal) throws TransactionException {
		if (retryGlobal || !DELAY_HANDLE_SESSION) {
			long beginTime = System.currentTimeMillis();
			boolean retryBranch = globalSession.getStatus() == GlobalStatus.CommitRetrying;
			globalSession.changeGlobalStatus(GlobalStatus.Committed);
			globalSession.end();
			if (!DELAY_HANDLE_SESSION) {
				MetricsPublisher.postSessionDoneEvent(globalSession, false, false);
			}
			MetricsPublisher.postSessionDoneEvent(globalSession, IdConstants.STATUS_VALUE_AFTER_COMMITTED_KEY, true,
					beginTime, retryBranch);
		}
		else {
			MetricsPublisher.postSessionDoneEvent(globalSession, false, false);
		}
	}

	/**
	 * End commit failed.
	 * @param globalSession the global session
	 * @param retryGlobal the retry global
	 * @throws TransactionException the transaction exception
	 */
	public static void endCommitFailed(GlobalSession globalSession, boolean retryGlobal) throws TransactionException {
		endCommitFailed(globalSession, retryGlobal, false);
	}

	/**
	 * End commit failed.
	 * @param globalSession the global session
	 * @param retryGlobal the retry global
	 * @param isRetryTimeout is retry timeout
	 * @throws TransactionException the transaction exception
	 */
	public static void endCommitFailed(GlobalSession globalSession, boolean retryGlobal, boolean isRetryTimeout)
			throws TransactionException {
		if (isRetryTimeout) {
			globalSession.changeGlobalStatus(GlobalStatus.CommitRetryTimeout);
		}
		else {
			globalSession.changeGlobalStatus(GlobalStatus.CommitFailed);
		}
		LOGGER.error("The Global session {} has changed the status to {}, need to be handled it manually.",
				globalSession.getXid(), globalSession.getStatus());

		globalSession.end();
		MetricsPublisher.postSessionDoneEvent(globalSession, retryGlobal, false);
	}

	/**
	 * End rollbacked.
	 * @param globalSession the global session
	 * @param retryGlobal the retry global
	 * @throws TransactionException the transaction exception
	 */
	public static void endRollbacked(GlobalSession globalSession, boolean retryGlobal) throws TransactionException {
		if (retryGlobal || !DELAY_HANDLE_SESSION) {
			long beginTime = System.currentTimeMillis();
			boolean timeoutDone = false;
			GlobalStatus currentStatus = globalSession.getStatus();
			if (currentStatus == GlobalStatus.TimeoutRollbacking) {
				MetricsPublisher.postSessionDoneEvent(globalSession, GlobalStatus.TimeoutRollbacked, false, false);
				timeoutDone = true;
			}
			boolean retryBranch = currentStatus == GlobalStatus.TimeoutRollbackRetrying
					|| currentStatus == GlobalStatus.RollbackRetrying;
			if (SessionStatusValidator.isTimeoutGlobalStatus(currentStatus)) {
				globalSession.changeGlobalStatus(GlobalStatus.TimeoutRollbacked);
			}
			else {
				globalSession.changeGlobalStatus(GlobalStatus.Rollbacked);
			}
			globalSession.end();
			if (!DELAY_HANDLE_SESSION && !timeoutDone) {
				MetricsPublisher.postSessionDoneEvent(globalSession, false, false);
			}
			MetricsPublisher.postSessionDoneEvent(globalSession, IdConstants.STATUS_VALUE_AFTER_ROLLBACKED_KEY, true,
					beginTime, retryBranch);
		}
		else {
			MetricsPublisher.postSessionDoneEvent(globalSession, GlobalStatus.Rollbacked, false, false);
		}
	}

	/**
	 * End rollback failed.
	 * @param globalSession the global session
	 * @param retryGlobal the retry global
	 * @throws TransactionException the transaction exception
	 */
	public static void endRollbackFailed(GlobalSession globalSession, boolean retryGlobal) throws TransactionException {
		endRollbackFailed(globalSession, retryGlobal, false);
	}

	/**
	 * End rollback failed.
	 * @param globalSession the global session
	 * @param retryGlobal the retry global
	 * @param isRetryTimeout is retry timeout
	 * @throws TransactionException the transaction exception
	 */
	public static void endRollbackFailed(GlobalSession globalSession, boolean retryGlobal, boolean isRetryTimeout)
			throws TransactionException {
		GlobalStatus currentStatus = globalSession.getStatus();
		if (isRetryTimeout) {
			globalSession.changeGlobalStatus(GlobalStatus.RollbackRetryTimeout);
		}
		else if (SessionStatusValidator.isTimeoutGlobalStatus(currentStatus)) {
			globalSession.changeGlobalStatus(GlobalStatus.TimeoutRollbackFailed);
		}
		else {
			globalSession.changeGlobalStatus(GlobalStatus.RollbackFailed);
		}
		LOGGER.error("The Global session {} has changed the status to {}, need to be handled it manually.",
				globalSession.getXid(), globalSession.getStatus());
		globalSession.end();
		MetricsPublisher.postSessionDoneEvent(globalSession, retryGlobal, false);
	}

	/**
	 * Foreach global sessions.
	 * @param sessions the global sessions
	 * @param handler the handler
	 * @since 1.5.0
	 */
	public static void forEach(Collection<GlobalSession> sessions, GlobalSessionHandler handler) {
		if (CollectionUtils.isEmpty(sessions)) {
			return;
		}
		sessions.parallelStream().forEach(globalSession -> {
			try {
				MDC.put(RootContext.MDC_KEY_XID, globalSession.getXid());
				handler.handle(globalSession);
			}
			catch (Throwable th) {
				LOGGER.error("handle global session failed: {}", globalSession.getXid(), th);
			}
			finally {
				MDC.remove(RootContext.MDC_KEY_XID);
			}
		});
	}

	/**
	 * Foreach branch sessions.
	 * @param sessions the branch session
	 * @param handler the handler
	 * @since 1.5.0
	 */
	public static Boolean forEach(Collection<BranchSession> sessions, BranchSessionHandler handler)
			throws TransactionException {
		Boolean result;
		for (BranchSession branchSession : sessions) {
			try {
				MDC.put(RootContext.MDC_KEY_BRANCH_ID, String.valueOf(branchSession.getBranchId()));
				result = handler.handle(branchSession);
				if (result == null) {
					continue;
				}
				return result;
			}
			finally {
				MDC.remove(RootContext.MDC_KEY_BRANCH_ID);
			}
		}
		return null;
	}

	/**
	 * remove branchSession from globalSession
	 * @param globalSession the globalSession
	 * @param branchSession the branchSession
	 * @param isAsync if asynchronous remove
	 */
	public static void removeBranch(GlobalSession globalSession, BranchSession branchSession, boolean isAsync)
			throws TransactionException {
		if (Objects.equals(Boolean.TRUE, ENABLE_BRANCH_ASYNC_REMOVE) && isAsync) {
			COORDINATOR.doBranchRemoveAsync(globalSession, branchSession);
		}
		else {
			globalSession.removeBranch(branchSession);
		}
	}

	/**
	 * remove branchSession from globalSession
	 * @param globalSession the globalSession
	 * @param isAsync if asynchronous remove
	 */
	public static void removeAllBranch(GlobalSession globalSession, boolean isAsync) throws TransactionException {
		List<BranchSession> branchSessions = globalSession.getSortedBranches();
		if (branchSessions == null || branchSessions.isEmpty()) {
			return;
		}
		if (Objects.equals(Boolean.TRUE, ENABLE_BRANCH_ASYNC_REMOVE) && isAsync) {
			COORDINATOR.doBranchRemoveAllAsync(globalSession);
		}
		else {
			for (BranchSession branchSession : branchSessions) {
				globalSession.removeBranch(branchSession);
			}
		}
	}

}
